feat(config): use of webpack externals

[MrChoclate]

fix #2141

[filipesilva]

Putting this PR on hold until I can better investigate #2141

[gregvis]

I require externals for using Angular 2 with Electron.

For example, i'm using an npm library called 'drivelist' which calls a node 'child_process'. The only way I could get this to work with ng-serve is to make 'drivelist' external and have Electron load the module.

For ng serve, i included the external like this to work:

 externals: {
            'drivelist': 'commonjs '+ path.resolve(projectRoot, 'node_modules', 'drivelist'),
           'electron': 'commonjs electron'

        }

Then in Electron, i'm just loading the ng serve url:

win = new BrowserWindow({width: 800, height: 600})
win.loadURL('http://localhost:4200');

[filipesilva]

Closing in favor of #3814

[epieddy]

@filipesilva The stuff in #3814 is not related to being able to use the externals configuration of webpack.

We need the options provided in this PR.

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